18994570 has 16 divisors (see below), whose sum is σ = 39074688. Its totient is φ = 6512400.

The previous prime is 18994561. The next prime is 18994571. The reversal of 18994570 is 7549981.

It is not an unprimeable number, because it can be changed into a prime (18994571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135606 + ... + 135745.

It is an arithmetic number, because the mean of its divisors is an integer number (2442168).

Almost surely, 2^18994570 is an apocalyptic number.

18994570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18994570 is an abundant number, since it is smaller than the sum of its proper divisors (20080118).

18994570 is a wasteful number, since it uses less digits than its factorization.

18994570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271365.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 18994570 is about 4358.2760353149. The cubic root of 18994570 is about 266.8147424135.

The spelling of 18994570 in words is "eighteen million, nine hundred ninety-four thousand, five hundred seventy".